arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.01206cond-mat.str-elcond-mat.supr-con
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CeIr3超导体的电子结构:DMFT研究

Electronic structure of CeIr3 superconductor: DMFT studies

Sylwia Gutowska, Bartlomiej Wiendlocha

摘要:

本文用动态平均场论(DMFT)计算了CeIr $_3$超导体的能带结构.标准GGA和GGA+U方法不能再现实验的电子比热系数$γ_{\rm expt.}$,这是由于低估了费米能级$N(E_F)$处的态密度,然后高估了作为$γ_{\rm expt.}$的重整化计算的电子-声子耦合(EPC)的强度。DMFT研究显示Ce的$4f$态与Ir的$5d$ -态的强杂化,这导致较大的$N(E_F)$给出正确的$γ_{\rm expt.}$,具有与实验数据一致的中等EPC。

英文摘要:

We present the band structure of CeIr$_3$ superconductor calculated within the dynamical mean field theory (DMFT). Standard GGA and GGA+U methods fail to reproduce the experimental electronic specific heat coefficient $γ_{\rm expt.}$ due to the underestimated density of states at the Fermi level $N(E_F)$ followed by an overestimated strength of electron-phonon coupling (EPC) calculated as a renormalization of $γ_{\rm expt.}$. The DMFT study shows a strong hybridization of $4f$ states of Ce with $5d$-states of Ir, which leads to the larger $N(E_F)$ giving the correct $γ_{\rm expt.}$ with a moderate EPC in agreement with the experimental data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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